[squid-users] affinity session load balancing

[Antony Stone]

On Monday 16 November 2015 at 12:17:49, Patrick Chemla wrote:

> Hi,
> 
> This is exactly the problem.
> 
> When users connect to the application, they go through the squid, then
> reach a login page where they enter login/passwd.
> 
> The application creates cookies including a PHPSESSION cookie.
> 
> Can squid use such cookie?

I do not believe Squid can do session-affinity load balancing based on cookies 
(but I'm happy to be corrected by anyone who knows better).

You may be better off using Apache in proxy/balancing mode: 
https://httpd.apache.org/docs/trunk/mod/mod_proxy_balancer.html

https://opensourcehacker.com/2011/04/15/sticky/


Regards,


Antony.

> On 16/11/2015 12:49, Antony Stone wrote:
> > On Monday 16 November 2015 at 11:32:31, Patrick Chemla wrote:
> >> I am doing load balancing as sourcehash, so on IP source.
> >> 
> >> The problem is that about 80% of clients come from the same IP, so I
> >> have a highly loaded backend, while other are sleeping.
> >> 
> >> So whatever you call it, on haproxy they call it session affinity LB,
> >> my need is to use a round-robin load balancing, but, very important,
> >> each user should always directed to the same backend.
> > 
> > So, the question remains "how do you identify a session?" (or maybe you
> > could rephrase it as "how do you identify a user?").
> > 
> >> Can we do that with squid? avoiding user login on squid (userhash is not
> >> convenient)?
> > 
> > You've already said that source IP is not a reliable indication of the
> > user (and this is very often true anyway), so what additional
> > information exists in the requests to identify a session / user?
> > 
> > Without knowing what application you're dealing with, we can't guess this
> > for ourselves.
> > 
> > Regards,
> > 
> > 
> > Antony.
> > 
> >> On 16/11/2015 11:41, Antony Stone wrote:
> >>> On Monday 16 November 2015 at 10:35:39, Patrick Chemla wrote:
> >>>> Hi,
> >>>> 
> >>>> I am using squid for years, maybe with basic features, and I have a
> >>>> problem today with an app where I need to manage multiple backends, be
> >>>> sure that a user is always sent to the same one because the app writes
> >>>> on local disk, and I have 80% users coming from same IP.
> >>> 
> >>> Is this Squid operating in accelerator mode (in front of the server/s)
> >>> or in proxying mode (being used by the clients)?
> >>> 
> >>>> So I need to load balance, not on the soucre IP, and I can't have a
> >>>> login on squid to identify each user, because it will create a double
> >>>> connexion procedure with the application login.
> >>> 
> >>> How does the app distinguish between different clients *without* Squid
> >>> being involved?
> >>> 
> >>>> Is there a way that squid will recognize a new connexion, maybe same
> >>>> IP, and load balnace it to any backend using round-robin? some
> >>>> affinity session load balancing?
> >>> 
> >>> The first thing needed to answer that is a definition of "session".
> >>> 
> >>> 
> >>> Regards,
> >>> 
> >>> Antony.
> 
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